Rockford Gtr Rockford AP Weather Records (USW00094822)
Record envelope, standing records and threshold days for Rockford Gtr Rockford AP (USW00094822), Illinois, United States, with 76 years of record.
Key Facts for Rockford Gtr Rockford AP
- Rockford Gtr Rockford AP (USW00094822) is a weather station in Illinois, United States at 42.19 latitude and -89.09 longitude, 221 m (725 ft) above sea level.
- The station reports from 1951 to 2026, 76 years of record.
- 1,464 records set at Rockford Gtr Rockford AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Rockford Gtr Rockford AP set a daily record high minimum temperature of 18.3 C (64.9 F) on 13 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Illinois, United States, 42.19 latitude, -89.09 longitude.
- Elevation: 221 m (725 ft).
- Period of record: 1951 to 2026, 76 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
11 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 17.2 C (63.0 F) | -34.9 C (-30.8 F) | 15.0 C (59.0 F) | -25.6 C (-14.1 F) |
| Feb | 25.6 C (78.1 F) | -31.1 C (-24.0 F) | 18.9 C (66.0 F) | -18.3 C (-0.9 F) |
| Mar | 29.4 C (84.9 F) | -23.9 C (-11.0 F) | 27.8 C (82.0 F) | -13.9 C (7.0 F) |
| Apr | 32.8 C (91.0 F) | -15.0 C (5.0 F) | 27.8 C (82.0 F) | -3.9 C (25.0 F) |
| May | 37.2 C (99.0 F) | -4.4 C (24.1 F) | 32.8 C (91.0 F) | -2.8 C (27.0 F) |
| Jun | 38.3 C (100.9 F) | 2.8 C (37.0 F) | 32.8 C (91.0 F) | 7.2 C (45.0 F) |
| Jul | 40.6 C (105.1 F) | 6.1 C (43.0 F) | 35.6 C (96.1 F) | 11.1 C (52.0 F) |
| Aug | 40.0 C (104.0 F) | 5.0 C (41.0 F) | 31.1 C (88.0 F) | 10.0 C (50.0 F) |
| Sep | 38.9 C (102.0 F) | -2.8 C (27.0 F) | 35.6 C (96.1 F) | 6.7 C (44.1 F) |
| Oct | 32.2 C (90.0 F) | -9.4 C (15.1 F) | 31.1 C (88.0 F) | 5.0 C (41.0 F) |
| Nov | 25.0 C (77.0 F) | -23.3 C (-9.9 F) | n/a | n/a |
| Dec | 20.6 C (69.1 F) | -31.1 C (-24.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1951 | 19 |
| 1952 | 23 |
| 1953 | 25 |
| 1954 | 13 |
| 1955 | 32 |
| 1956 | 16 |
| 1957 | 12 |
| 1958 | 16 |
| 1959 | 22 |
| 1960 | 17 |
| 1961 | 12 |
| 1962 | 24 |
| 1963 | 29 |
| 1964 | 22 |
| 1965 | 30 |
| 1966 | 21 |
| 1967 | 36 |
| 1968 | 18 |
| 1969 | 13 |
| 1970 | 20 |
| 1971 | 18 |
| 1972 | 17 |
| 1973 | 15 |
| 1974 | 16 |
| 1975 | 20 |
| 1976 | 33 |
| 1977 | 24 |
| 1978 | 15 |
| 1979 | 27 |
| 1980 | 16 |
| 1981 | 13 |
| 1982 | 22 |
| 1983 | 32 |
| 1984 | 23 |
| 1985 | 22 |
| 1986 | 21 |
| 1987 | 14 |
| 1988 | 39 |
| 1989 | 27 |
| 1990 | 18 |
| 1991 | 29 |
| 1992 | 22 |
| 1993 | 12 |
| 1994 | 18 |
| 1995 | 17 |
| 1996 | 19 |
| 1997 | 18 |
| 1998 | 17 |
| 1999 | 11 |
| 2000 | 22 |
| 2001 | 11 |
| 2002 | 17 |
| 2003 | 9 |
| 2004 | 5 |
| 2005 | 17 |
| 2006 | 16 |
| 2007 | 19 |
| 2008 | 10 |
| 2009 | 17 |
| 2010 | 12 |
| 2011 | 13 |
| 2012 | 43 |
| 2013 | 9 |
| 2014 | 23 |
| 2015 | 20 |
| 2016 | 9 |
| 2017 | 27 |
| 2018 | 11 |
| 2019 | 22 |
| 2020 | 16 |
| 2021 | 23 |
| 2022 | 13 |
| 2023 | 16 |
| 2024 | 19 |
| 2025 | 15 |
| 2026 | 15 |
All-Time Record Progression
12 new records| Date | Kind | Detail |
|---|---|---|
| 1982-01-10 | Record low minimum temperature | Record low minimum temperature -32.8 C (-27.0 F) |
| 1983-12-23 | Record low maximum temperature | Record low maximum temperature -23.9 C (-11.0 F) |
| 1987-08-14 | Record daily precipitation | Record daily precipitation 144.8 mm (5.7 in) |
| 1987-12-15 | Record daily snowfall | Record daily snowfall 26.9 cm (10.6 in) |
| 1988-08-16 | Record high maximum temperature | Record high maximum temperature 40.0 C (104.0 F) |
| 1994-01-15 | Record low maximum temperature | Record low maximum temperature -25.0 C (-13.0 F) |
| 1994-01-18 | Record low maximum temperature | Record low maximum temperature -25.6 C (-14.1 F) |
| 2011-02-01 | Record daily snowfall | Record daily snowfall 27.7 cm (10.9 in) |
| 2012-07-07 | Record high maximum temperature | Record high maximum temperature 40.6 C (105.1 F) |
| 2018-11-25 | Record daily snowfall | Record daily snowfall 29.7 cm (11.7 in) |
| 2019-01-31 | Record low minimum temperature | Record low minimum temperature -34.9 C (-30.8 F) |
| 2019-07-19 | Record high minimum temperature | Record high minimum temperature 26.7 C (80.1 F) |
Wettest Day of Each Month
Aug: 144.8 mm (5.7 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 62.5 mm (2.5 in) | 12 January 1960 |
| Feb | 41.9 mm (1.6 in) | 9 February 1966 |
| Mar | 63.5 mm (2.5 in) | 4 March 1976 |
| Apr | 85.9 mm (3.4 in) | 21 April 1973 |
| May | 121.2 mm (4.8 in) | 28 May 1996 |
| Jun | 106.7 mm (4.2 in) | 19 June 2009 |
| Jul | 126.7 mm (5.0 in) | 8 July 1951 |
| Aug | 144.8 mm (5.7 in) | 14 August 1987 |
| Sep | 141.2 mm (5.6 in) | 13 September 1961 |
| Oct | 121.4 mm (4.8 in) | 10 October 1954 |
| Nov | 53.1 mm (2.1 in) | 16 November 1961 |
| Dec | 50.8 mm (2.0 in) | 2 December 1982 |
Period of Record Coverage
1951 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 286 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 13 October 2026 | Rockford Gtr Rockford AP, US | daily high min (Provisional) | 18.3 C (64.9 F) | 2.2 C (4.0 F) | 17 years | 16 of 100 (Routine) |
| 12 October 2026 | Rockford Gtr Rockford AP, US | daily high max (Provisional) | 31.1 C (88.0 F) | 1.7 C (3.1 F) | 17 years | 14 of 100 (Routine) |
| 30 September 2026 | Rockford Gtr Rockford AP, US | daily rain (Provisional) | 24.1 mm (0.9 in) | 0.7 mm (0.03 in) | 48 years | 20 of 100 (Routine) |
| 19 September 2026 | Rockford Gtr Rockford AP, US | daily rain (Provisional) | 66.8 mm (2.6 in) | 6.3 mm (0.25 in) | 57 years | 28 of 100 (Routine) |
| 4 September 2026 | Rockford Gtr Rockford AP, US | daily high min (Provisional) | 22.8 C (73.0 F) | 0.6 C (1.1 F) | 8 years | 10 of 100 (Routine) |
| 3 September 2026 | Rockford Gtr Rockford AP, US | daily high min (Provisional) | 22.8 C (73.0 F) | 1.1 C (2.0 F) | 55 years | 25 of 100 (Routine) |
| 31 August 2026 | Rockford Gtr Rockford AP, US | daily high min (Tie, Provisional) | 22.2 C (72.0 F) | tie | 16 years | 2 of 100 (Routine) |
| 1 August 2026 | Rockford Gtr Rockford AP, US | daily low max (Tie) | 20.6 C (69.1 F) | tie | 52 years | 5 of 100 (Routine) |
| 27 July 2026 | Rockford Gtr Rockford AP, US | daily high min (Tie) | 23.3 C (73.9 F) | tie | 71 years | 7 of 100 (Routine) |
| 30 June 2026 | Rockford Gtr Rockford AP, US | monthly high min (Tie) | 25.0 C (77.0 F) | tie | 45 years | 7 of 100 (Routine) |
| 29 June 2026 | Rockford Gtr Rockford AP, US | daily high min | 23.9 C (75.0 F) | 0.6 C (1.1 F) | 73 years | 30 of 100 (Routine) |
| 11 June 2026 | Rockford Gtr Rockford AP, US | daily rain | 53.1 mm (2.1 in) | 25.2 mm (1.0 in) | 28 years | 31 of 100 (Routine) |
| 9 June 2026 | Rockford Gtr Rockford AP, US | daily high min (Tie) | 21.7 C (71.1 F) | tie | 5 years | 2 of 100 (Routine) |
| 6 June 2026 | Rockford Gtr Rockford AP, US | daily high min | 20.6 C (69.1 F) | 0.6 C (1.1 F) | 27 years | 16 of 100 (Routine) |
| 7 May 2026 | Rockford Gtr Rockford AP, US | daily low min | -2.8 C (27.0 F) | 0.6 C (1.1 F) | 49 years | 22 of 100 (Routine) |
| 2 May 2026 | Rockford Gtr Rockford AP, US | daily low min | -2.8 C (27.0 F) | 0.6 C (1.1 F) | 60 years | 26 of 100 (Routine) |
| 13 April 2026 | Rockford Gtr Rockford AP, US | daily high min | 15.6 C (60.1 F) | 3.4 C (6.1 F) | 71 years | 35 of 100 (Notable) |
| 30 March 2026 | Rockford Gtr Rockford AP, US | daily high max | 27.8 C (82.0 F) | 2.2 C (4.0 F) | 28 years | 18 of 100 (Routine) |
| 17 March 2026 | Rockford Gtr Rockford AP, US | daily low min | -13.9 C (7.0 F) | 1.7 C (3.1 F) | 67 years | 29 of 100 (Routine) |
| 17 March 2026 | Rockford Gtr Rockford AP, US | daily low max | -6.1 C (21.0 F) | 1.7 C (3.1 F) | 32 years | 18 of 100 (Routine) |
Climate Trend
75 complete years, 1951 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1951 | 7.7 C | -1.53 C |
| 1952 | 9.6 C | +0.37 C |
| 1953 | 10.1 C | +0.85 C |
| 1954 | 9.8 C | +0.53 C |
| 1955 | 9.5 C | +0.23 C |
| 1956 | 9.6 C | +0.35 C |
| 1957 | 9.2 C | -0.07 C |
| 1958 | 8.4 C | -0.84 C |
| 1959 | 8.9 C | -0.36 C |
| 1960 | 8.5 C | -0.72 C |
| 1961 | 9.1 C | -0.14 C |
| 1962 | 8.4 C | -0.83 C |
| 1963 | 8.6 C | -0.66 C |
| 1964 | 9.0 C | -0.23 C |
| 1965 | 8.7 C | -0.54 C |
| 1966 | 8.3 C | -0.98 C |
| 1967 | 8.0 C | -1.19 C |
| 1968 | 9.1 C | -0.17 C |
| 1969 | 8.4 C | -0.79 C |
| 1970 | 8.6 C | -0.59 C |
| 1971 | 9.6 C | +0.32 C |
| 1972 | 7.9 C | -1.31 C |
| 1973 | 10.1 C | +0.83 C |
| 1974 | 8.9 C | -0.29 C |
| 1975 | 9.0 C | -0.27 C |
| 1976 | 7.7 C | -1.54 C |
| 1977 | 8.8 C | -0.39 C |
| 1978 | 7.7 C | -1.55 C |
| 1979 | 7.3 C | -1.91 C |
| 1980 | 8.3 C | -0.90 C |
| 1981 | 9.1 C | -0.18 C |
| 1982 | 8.4 C | -0.83 C |
| 1983 | 9.2 C | +0.00 C |
| 1984 | 8.9 C | -0.37 C |
| 1985 | 8.1 C | -1.09 C |
| 1986 | 9.4 C | +0.12 C |
| 1987 | 10.4 C | +1.13 C |
| 1988 | 9.2 C | -0.03 C |
| 1989 | 8.1 C | -1.09 C |
| 1990 | 9.8 C | +0.56 C |
| 1991 | 9.9 C | +0.70 C |
| 1992 | 8.9 C | -0.30 C |
| 1993 | 8.6 C | -0.60 C |
| 1994 | 8.9 C | -0.35 C |
| 1995 | 8.8 C | -0.44 C |
| 1996 | 7.6 C | -1.60 C |
| 1997 | 8.4 C | -0.86 C |
| 1998 | 10.9 C | +1.63 C |
| 1999 | 9.7 C | +0.50 C |
| 2000 | 9.1 C | -0.12 C |
| 2001 | 9.9 C | +0.67 C |
| 2002 | 9.8 C | +0.57 C |
| 2003 | 9.0 C | -0.25 C |
| 2004 | 9.3 C | +0.08 C |
| 2005 | 10.0 C | +0.73 C |
| 2006 | 10.3 C | +1.02 C |
| 2007 | 10.2 C | +0.94 C |
| 2008 | 8.7 C | -0.49 C |
| 2009 | 8.6 C | -0.68 C |
| 2010 | 10.1 C | +0.89 C |
| 2011 | 10.1 C | +0.83 C |
| 2012 | 11.7 C | +2.48 C |
| 2013 | 8.8 C | -0.46 C |
| 2014 | 7.8 C | -1.42 C |
| 2015 | 9.9 C | +0.65 C |
| 2016 | 11.1 C | +1.82 C |
| 2017 | 10.7 C | +1.42 C |
| 2018 | 9.3 C | +0.04 C |
| 2019 | 9.3 C | +0.05 C |
| 2020 | 10.8 C | +1.56 C |
| 2021 | 11.1 C | +1.90 C |
| 2022 | 9.6 C | +0.34 C |
| 2023 | 10.7 C | +1.49 C |
| 2024 | 11.6 C | +2.36 C |
| 2025 | 10.1 C | +0.85 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1951 to 2025. In Fahrenheit: 0.4 F (0.2 to 0.5) per decade. The slope is a straight line fitted to 75 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.2 C (0.1 to 0.3) per decade | 0.4 F (0.2 to 0.5) per decade | 1951 to 2025 | 75 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.3) per decade | 0.4 F (0.2 to 0.5) per decade | 1951 to 2025 | 75 | Rise |
| Mean daily minimum | 0.2 C (0.1 to 0.3) per decade | 0.4 F (0.2 to 0.6) per decade | 1951 to 2025 | 75 | Rise |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1951 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.6 C (105.1 F) | 2012 | 35.6 C (96.1 F) | 76 |
| Coldest night (TNn) | -34.9 C (-30.8 F) | 2019 | -25.8 C (-14.5 F) | 76 |
| Wettest day (Rx1day) | 144.8 mm (5.7 in) | 1987 | 64.8 mm (2.6 in) | 76 |
| Wettest five days (Rx5day) | 210.7 mm (8.3 in) | 2010 | 105.1 mm (4.1 in) | 76 |
| Longest dry spell (CDD) | 54 days | 1952 | 20 days | 76 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1951 | 33.9 C (93.0 F) |
| 1952 | 36.1 C (97.0 F) |
| 1953 | 38.9 C (102.0 F) |
| 1954 | 37.2 C (99.0 F) |
| 1955 | 39.4 C (102.9 F) |
| 1956 | 37.8 C (100.0 F) |
| 1957 | 36.1 C (97.0 F) |
| 1958 | 35.0 C (95.0 F) |
| 1959 | 35.0 C (95.0 F) |
| 1960 | 35.0 C (95.0 F) |
| 1961 | 34.4 C (93.9 F) |
| 1962 | 33.9 C (93.0 F) |
| 1963 | 36.7 C (98.1 F) |
| 1964 | 33.9 C (93.0 F) |
| 1965 | 37.2 C (99.0 F) |
| 1966 | 36.7 C (98.1 F) |
| 1967 | 32.8 C (91.0 F) |
| 1968 | 33.9 C (93.0 F) |
| 1969 | 33.3 C (91.9 F) |
| 1970 | 35.0 C (95.0 F) |
| 1971 | 36.7 C (98.1 F) |
| 1972 | 34.4 C (93.9 F) |
| 1973 | 34.4 C (93.9 F) |
| 1974 | 36.1 C (97.0 F) |
| 1975 | 35.0 C (95.0 F) |
| 1976 | 36.1 C (97.0 F) |
| 1977 | 36.7 C (98.1 F) |
| 1978 | 35.0 C (95.0 F) |
| 1979 | 33.3 C (91.9 F) |
| 1980 | 37.2 C (99.0 F) |
| 1981 | 35.0 C (95.0 F) |
| 1982 | 34.4 C (93.9 F) |
| 1983 | 37.2 C (99.0 F) |
| 1984 | 35.6 C (96.1 F) |
| 1985 | 35.6 C (96.1 F) |
| 1986 | 34.4 C (93.9 F) |
| 1987 | 36.7 C (98.1 F) |
| 1988 | 40.0 C (104.0 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 35.0 C (95.0 F) |
| 1991 | 37.2 C (99.0 F) |
| 1992 | 33.9 C (93.0 F) |
| 1993 | 33.3 C (91.9 F) |
| 1994 | 37.2 C (99.0 F) |
| 1995 | 36.7 C (98.1 F) |
| 1996 | 34.4 C (93.9 F) |
| 1997 | 35.0 C (95.0 F) |
| 1998 | 32.8 C (91.0 F) |
| 1999 | 36.1 C (97.0 F) |
| 2000 | 34.4 C (93.9 F) |
| 2001 | 35.6 C (96.1 F) |
| 2002 | 36.7 C (98.1 F) |
| 2003 | 36.7 C (98.1 F) |
| 2004 | 32.2 C (90.0 F) |
| 2005 | 37.2 C (99.0 F) |
| 2006 | 35.6 C (96.1 F) |
| 2007 | 33.9 C (93.0 F) |
| 2008 | 33.9 C (93.0 F) |
| 2009 | 33.9 C (93.0 F) |
| 2010 | 33.9 C (93.0 F) |
| 2011 | 37.8 C (100.0 F) |
| 2012 | 40.6 C (105.1 F) |
| 2013 | 35.6 C (96.1 F) |
| 2014 | 32.8 C (91.0 F) |
| 2015 | 33.3 C (91.9 F) |
| 2016 | 34.4 C (93.9 F) |
| 2017 | 34.4 C (93.9 F) |
| 2018 | 36.1 C (97.0 F) |
| 2019 | 36.1 C (97.0 F) |
| 2020 | 35.0 C (95.0 F) |
| 2021 | 37.2 C (99.0 F) |
| 2022 | 37.8 C (100.0 F) |
| 2023 | 36.1 C (97.0 F) |
| 2024 | 36.7 C (98.1 F) |
| 2025 | 34.4 C (93.9 F) |
| 2026 | 35.6 C (96.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1951 | -28.9 C (-20.0 F) |
| 1952 | -22.8 C (-9.0 F) |
| 1953 | -22.8 C (-9.0 F) |
| 1954 | -23.9 C (-11.0 F) |
| 1955 | -25.0 C (-13.0 F) |
| 1956 | -20.0 C (-4.0 F) |
| 1957 | -26.1 C (-15.0 F) |
| 1958 | -27.2 C (-17.0 F) |
| 1959 | -28.9 C (-20.0 F) |
| 1960 | -28.9 C (-20.0 F) |
| 1961 | -23.3 C (-9.9 F) |
| 1962 | -26.7 C (-16.1 F) |
| 1963 | -30.0 C (-22.0 F) |
| 1964 | -23.3 C (-9.9 F) |
| 1965 | -26.7 C (-16.1 F) |
| 1966 | -28.9 C (-20.0 F) |
| 1967 | -26.7 C (-16.1 F) |
| 1968 | -27.2 C (-17.0 F) |
| 1969 | -23.3 C (-9.9 F) |
| 1970 | -30.0 C (-22.0 F) |
| 1971 | -25.6 C (-14.1 F) |
| 1972 | -28.3 C (-18.9 F) |
| 1973 | -23.9 C (-11.0 F) |
| 1974 | -29.4 C (-20.9 F) |
| 1975 | -25.0 C (-13.0 F) |
| 1976 | -30.0 C (-22.0 F) |
| 1977 | -30.0 C (-22.0 F) |
| 1978 | -25.0 C (-13.0 F) |
| 1979 | -31.1 C (-24.0 F) |
| 1980 | -24.4 C (-11.9 F) |
| 1981 | -26.1 C (-15.0 F) |
| 1982 | -32.8 C (-27.0 F) |
| 1983 | -31.1 C (-24.0 F) |
| 1984 | -30.0 C (-22.0 F) |
| 1985 | -32.2 C (-26.0 F) |
| 1986 | -28.3 C (-18.9 F) |
| 1987 | -21.7 C (-7.1 F) |
| 1988 | -29.4 C (-20.9 F) |
| 1989 | -28.9 C (-20.0 F) |
| 1990 | -22.8 C (-9.0 F) |
| 1991 | -25.0 C (-13.0 F) |
| 1992 | -23.3 C (-9.9 F) |
| 1993 | -23.9 C (-11.0 F) |
| 1994 | -31.1 C (-24.0 F) |
| 1995 | -20.6 C (-5.1 F) |
| 1996 | -31.1 C (-24.0 F) |
| 1997 | -25.0 C (-13.0 F) |
| 1998 | -21.1 C (-6.0 F) |
| 1999 | -29.4 C (-20.9 F) |
| 2000 | -30.0 C (-22.0 F) |
| 2001 | -22.2 C (-8.0 F) |
| 2002 | -23.9 C (-11.0 F) |
| 2003 | -21.7 C (-7.1 F) |
| 2004 | -24.4 C (-11.9 F) |
| 2005 | -22.2 C (-8.0 F) |
| 2006 | -23.9 C (-11.0 F) |
| 2007 | -25.0 C (-13.0 F) |
| 2008 | -26.7 C (-16.1 F) |
| 2009 | -31.7 C (-25.1 F) |
| 2010 | -23.3 C (-9.9 F) |
| 2011 | -28.9 C (-20.0 F) |
| 2012 | -17.8 C (0.0 F) |
| 2013 | -23.8 C (-10.8 F) |
| 2014 | -29.3 C (-20.7 F) |
| 2015 | -26.6 C (-15.9 F) |
| 2016 | -24.9 C (-12.8 F) |
| 2017 | -22.7 C (-8.9 F) |
| 2018 | -26.6 C (-15.9 F) |
| 2019 | -34.9 C (-30.8 F) |
| 2020 | -23.2 C (-9.8 F) |
| 2021 | -24.3 C (-11.7 F) |
| 2022 | -27.7 C (-17.9 F) |
| 2023 | -23.8 C (-10.8 F) |
| 2024 | -26.6 C (-15.9 F) |
| 2025 | -23.8 C (-10.8 F) |
| 2026 | -25.6 C (-14.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1951 | 126.7 mm (5.0 in) |
| 1952 | 119.4 mm (4.7 in) |
| 1953 | 45.2 mm (1.8 in) |
| 1954 | 121.4 mm (4.8 in) |
| 1955 | 36.8 mm (1.4 in) |
| 1956 | 48.5 mm (1.9 in) |
| 1957 | 40.1 mm (1.6 in) |
| 1958 | 72.1 mm (2.8 in) |
| 1959 | 107.2 mm (4.2 in) |
| 1960 | 65.0 mm (2.6 in) |
| 1961 | 141.2 mm (5.6 in) |
| 1962 | 59.2 mm (2.3 in) |
| 1963 | 66.5 mm (2.6 in) |
| 1964 | 59.4 mm (2.3 in) |
| 1965 | 56.9 mm (2.2 in) |
| 1966 | 54.4 mm (2.1 in) |
| 1967 | 84.3 mm (3.3 in) |
| 1968 | 90.9 mm (3.6 in) |
| 1969 | 87.1 mm (3.4 in) |
| 1970 | 56.1 mm (2.2 in) |
| 1971 | 43.4 mm (1.7 in) |
| 1972 | 107.2 mm (4.2 in) |
| 1973 | 85.9 mm (3.4 in) |
| 1974 | 64.5 mm (2.5 in) |
| 1975 | 38.6 mm (1.5 in) |
| 1976 | 63.5 mm (2.5 in) |
| 1977 | 91.7 mm (3.6 in) |
| 1978 | 64.8 mm (2.6 in) |
| 1979 | 55.1 mm (2.2 in) |
| 1980 | 68.3 mm (2.7 in) |
| 1981 | 64.8 mm (2.6 in) |
| 1982 | 64.8 mm (2.6 in) |
| 1983 | 60.7 mm (2.4 in) |
| 1984 | 55.4 mm (2.2 in) |
| 1985 | 47.0 mm (1.9 in) |
| 1986 | 82.8 mm (3.3 in) |
| 1987 | 144.8 mm (5.7 in) |
| 1988 | 33.3 mm (1.3 in) |
| 1989 | 50.8 mm (2.0 in) |
| 1990 | 86.6 mm (3.4 in) |
| 1991 | 71.6 mm (2.8 in) |
| 1992 | 42.2 mm (1.7 in) |
| 1993 | 51.8 mm (2.0 in) |
| 1994 | 64.0 mm (2.5 in) |
| 1995 | 45.7 mm (1.8 in) |
| 1996 | 121.2 mm (4.8 in) |
| 1997 | 70.9 mm (2.8 in) |
| 1998 | 51.1 mm (2.0 in) |
| 1999 | 54.6 mm (2.1 in) |
| 2000 | 78.7 mm (3.1 in) |
| 2001 | 61.0 mm (2.4 in) |
| 2002 | 96.5 mm (3.8 in) |
| 2003 | 40.6 mm (1.6 in) |
| 2004 | 68.6 mm (2.7 in) |
| 2005 | 56.6 mm (2.2 in) |
| 2006 | 43.4 mm (1.7 in) |
| 2007 | 130.8 mm (5.1 in) |
| 2008 | 60.5 mm (2.4 in) |
| 2009 | 106.7 mm (4.2 in) |
| 2010 | 119.4 mm (4.7 in) |
| 2011 | 99.8 mm (3.9 in) |
| 2012 | 57.4 mm (2.3 in) |
| 2013 | 77.7 mm (3.1 in) |
| 2014 | 56.9 mm (2.2 in) |
| 2015 | 72.9 mm (2.9 in) |
| 2016 | 41.7 mm (1.6 in) |
| 2017 | 104.4 mm (4.1 in) |
| 2018 | 65.8 mm (2.6 in) |
| 2019 | 74.2 mm (2.9 in) |
| 2020 | 52.3 mm (2.1 in) |
| 2021 | 64.0 mm (2.5 in) |
| 2022 | 113.3 mm (4.5 in) |
| 2023 | 68.8 mm (2.7 in) |
| 2024 | 58.9 mm (2.3 in) |
| 2025 | 45.0 mm (1.8 in) |
| 2026 | 66.8 mm (2.6 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1951 | 144.5 mm (5.7 in) |
| 1952 | 197.2 mm (7.8 in) |
| 1953 | 82.3 mm (3.2 in) |
| 1954 | 144.5 mm (5.7 in) |
| 1955 | 56.4 mm (2.2 in) |
| 1956 | 108.8 mm (4.3 in) |
| 1957 | 60.0 mm (2.4 in) |
| 1958 | 94.5 mm (3.7 in) |
| 1959 | 119.9 mm (4.7 in) |
| 1960 | 110.6 mm (4.4 in) |
| 1961 | 181.1 mm (7.1 in) |
| 1962 | 60.7 mm (2.4 in) |
| 1963 | 93.7 mm (3.7 in) |
| 1964 | 89.4 mm (3.5 in) |
| 1965 | 106.7 mm (4.2 in) |
| 1966 | 78.0 mm (3.1 in) |
| 1967 | 161.0 mm (6.3 in) |
| 1968 | 104.7 mm (4.1 in) |
| 1969 | 157.1 mm (6.2 in) |
| 1970 | 108.7 mm (4.3 in) |
| 1971 | 57.4 mm (2.3 in) |
| 1972 | 149.4 mm (5.9 in) |
| 1973 | 155.3 mm (6.1 in) |
| 1974 | 105.4 mm (4.1 in) |
| 1975 | 50.6 mm (2.0 in) |
| 1976 | 85.4 mm (3.4 in) |
| 1977 | 98.0 mm (3.9 in) |
| 1978 | 93.7 mm (3.7 in) |
| 1979 | 85.5 mm (3.4 in) |
| 1980 | 72.1 mm (2.8 in) |
| 1981 | 109.9 mm (4.3 in) |
| 1982 | 117.6 mm (4.6 in) |
| 1983 | 80.3 mm (3.2 in) |
| 1984 | 72.7 mm (2.9 in) |
| 1985 | 82.5 mm (3.2 in) |
| 1986 | 141.8 mm (5.6 in) |
| 1987 | 180.1 mm (7.1 in) |
| 1988 | 62.2 mm (2.4 in) |
| 1989 | 111.8 mm (4.4 in) |
| 1990 | 128.5 mm (5.1 in) |
| 1991 | 84.1 mm (3.3 in) |
| 1992 | 61.6 mm (2.4 in) |
| 1993 | 111.0 mm (4.4 in) |
| 1994 | 126.0 mm (5.0 in) |
| 1995 | 70.9 mm (2.8 in) |
| 1996 | 189.0 mm (7.4 in) |
| 1997 | 86.9 mm (3.4 in) |
| 1998 | 65.6 mm (2.6 in) |
| 1999 | 109.0 mm (4.3 in) |
| 2000 | 116.4 mm (4.6 in) |
| 2001 | 112.5 mm (4.4 in) |
| 2002 | 156.7 mm (6.2 in) |
| 2003 | 74.9 mm (2.9 in) |
| 2004 | 94.0 mm (3.7 in) |
| 2005 | 81.2 mm (3.2 in) |
| 2006 | 77.0 mm (3.0 in) |
| 2007 | 166.8 mm (6.6 in) |
| 2008 | 99.1 mm (3.9 in) |
| 2009 | 123.8 mm (4.9 in) |
| 2010 | 210.7 mm (8.3 in) |
| 2011 | 104.1 mm (4.1 in) |
| 2012 | 73.4 mm (2.9 in) |
| 2013 | 125.2 mm (4.9 in) |
| 2014 | 96.8 mm (3.8 in) |
| 2015 | 85.3 mm (3.4 in) |
| 2016 | 80.3 mm (3.2 in) |
| 2017 | 124.7 mm (4.9 in) |
| 2018 | 147.6 mm (5.8 in) |
| 2019 | 143.6 mm (5.7 in) |
| 2020 | 133.3 mm (5.2 in) |
| 2021 | 80.3 mm (3.2 in) |
| 2022 | 156.2 mm (6.1 in) |
| 2023 | 95.7 mm (3.8 in) |
| 2024 | 115.6 mm (4.6 in) |
| 2025 | 63.5 mm (2.5 in) |
| 2026 | 130.5 mm (5.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1951 | 16 days |
| 1952 | 54 days |
| 1953 | 24 days |
| 1954 | 19 days |
| 1955 | 29 days |
| 1956 | 18 days |
| 1957 | 29 days |
| 1958 | 23 days |
| 1959 | 21 days |
| 1960 | 13 days |
| 1961 | 23 days |
| 1962 | 18 days |
| 1963 | 17 days |
| 1964 | 23 days |
| 1965 | 20 days |
| 1966 | 25 days |
| 1967 | 23 days |
| 1968 | 30 days |
| 1969 | 49 days |
| 1970 | 15 days |
| 1971 | 24 days |
| 1972 | 18 days |
| 1973 | 14 days |
| 1974 | 16 days |
| 1975 | 14 days |
| 1976 | 22 days |
| 1977 | 18 days |
| 1978 | 14 days |
| 1979 | 17 days |
| 1980 | 14 days |
| 1981 | 30 days |
| 1982 | 24 days |
| 1983 | 20 days |
| 1984 | 21 days |
| 1985 | 17 days |
| 1986 | 22 days |
| 1987 | 15 days |
| 1988 | 25 days |
| 1989 | 21 days |
| 1990 | 16 days |
| 1991 | 24 days |
| 1992 | 15 days |
| 1993 | 12 days |
| 1994 | 15 days |
| 1995 | 29 days |
| 1996 | 18 days |
| 1997 | 14 days |
| 1998 | 24 days |
| 1999 | 37 days |
| 2000 | 19 days |
| 2001 | 25 days |
| 2002 | 16 days |
| 2003 | 23 days |
| 2004 | 21 days |
| 2005 | 17 days |
| 2006 | 17 days |
| 2007 | 19 days |
| 2008 | 13 days |
| 2009 | 25 days |
| 2010 | 21 days |
| 2011 | 14 days |
| 2012 | 22 days |
| 2013 | 15 days |
| 2014 | 17 days |
| 2015 | 21 days |
| 2016 | 19 days |
| 2017 | 22 days |
| 2018 | 17 days |
| 2019 | 13 days |
| 2020 | 20 days |
| 2021 | 22 days |
| 2022 | 17 days |
| 2023 | 19 days |
| 2024 | 29 days |
| 2025 | 21 days |
| 2026 | 28 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
75 years with a frostAcross 75 years with a frost, the median last spring frost at Rockford Gtr Rockford AP falls on 27 April and the median first autumn frost on 11 October, which leaves a median of 166 days between them.
In 1996 to 2025 the median growing season was 171 days. That is 6 days more than in 1951 to 1980.
Fitted over all years, the growing season changes by +1.2 days per decade at this station.
| Measure | Median, all years | Earliest period (1951 to 1980) | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 27 April | 30 April | 27 April | 3 days earlier | -0.3 days per decade |
| First autumn frost | 11 October | 12 October | 15 October | 3 days later | +0.9 days per decade |
| Growing days | 166 days | 165 days | 171 days | 6 days more | +1.2 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
75 years, 1951 to 2025A day with at least 66.0 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 171.1 mm (6.7 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 66.0 mm (2.6 in) | |
| 5 years | 89.9 mm (3.5 in) | |
| 10 years | 107.3 mm (4.2 in) | |
| 25 years | 131.2 mm (5.2 in) | |
| 50 years | 150.5 mm (5.9 in) | |
| 100 years | 171.1 mm (6.7 in) | Longer than the 75 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 75 years of values from 1951 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 144.8 mm (5.7 in) in 1987; 141.2 mm (5.6 in) in 1961; 130.8 mm (5.1 in) in 2007.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Rockford Gtr Rockford AP had a mean temperature of 10.2 C (50.3 F) and 931.0 mm (36.7 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Plymouth Pwr Substn (United States, 249 km away), Lafayette 8 S (United States, 279 km away) and W Lafayette 6 NW (United States, 259 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Plymouth Pwr Substn | United States | 249 km (155 mi) | 10.1 C (50.3 F) | 957.0 mm (37.7 in) | 0.62 |
| Lafayette 8 S | United States | 279 km (173 mi) | 9.9 C (49.9 F) | 916.0 mm (36.1 in) | 0.65 |
| W Lafayette 6 NW | United States | 259 km (161 mi) | 9.9 C (49.9 F) | 919.3 mm (36.2 in) | 0.66 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-16 (16 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-16).